World's tallest buildings

Associated Press
This June 23, 2006 file photo shows the Chicago skyline with the nation's tallest building, the Sears Tower, far right, now called the Willis Tower, and the John Hancock Center, left, the city's fourth highest skyscraper. Since the 9/11attacks on New York's World Trade Center a decade ago, much has changed at skyscrapers around the country, but experts say obvious precautions still leave thousands of buildings vulnerable because the costs to retrofit existing structures may be too costly and cities and states may be slow to adopt newer, tougher building codes for new construction like those recommended after the deadliest terror attack on U.S. soil. (AP Photo/M. Spencer Green, File)

View gallery

12 photos

The world's tallest tower and Japan's biggest new landmark, the Tokyo Skytree, opened to the public on May 22. Dubai's Burj Khalifa holds the title of world's tallest structure, which stands 828 meters (2,717 feet).

View Comments (0)